Packing/unpacking of width and height in gfx::Size is redundant while using CreateJavaBitmap.

We pack width/height in ConvertToJavaBitmap into gfx::Size to be unpacked in CreateJavaBitmap
while calling the BitmapHelper.createBitmap method from Java. This is not needed and should
be called directly using width and height as is.

R=danakj

Review URL: https://codereview.chromium.org/159463004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@250916 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 250916